A gas leak is usually recognized by smell, sight or sound:

	Smell: Natural gas is colorless and odorless, so a distinct and recognizable odorant is added to natural gas so people detect and recognize it quickly.
	Sight: A dust cloud, mist, fog, bubbles in standing water or vegetation that appears to be dead or dying for no apparent reason.
	Sound: An unusual noise such as roaring, hissing or whistling.

What to do if you suspect a leak:

	Move to a safe location.
	Call from a safe location local emergency responders at 911 and MDU at 1-800-MDU-FAST (1-800-638-3278). Give them your name, phone number, description of the leak and its location.
	Do not strike a match, use telephones in the area of the leak, operate engines and motors, and light switches or turn appliances on or off. Do not turn on a flashlight in the area where you smell gas. These items can produce sparks that might ignite the gas and cause an explosion.
	Do not attempt to extinguish any pipeline fire that may start.
	Do not attempt to operate pipeline valves, leave this to the pipeline operator